A cluster in VMmanager is a group of physical servers where virtual machines are running.

Navigate to Statistics→ Cluster load.

Generate a report

  • Period — select a period:
    • previous day;
    • current day;
    • current week;
    • current month;
    • current year;
    • previous week
    • previous month;
    • previous year;
    • week;
    • month;
    • quarter;
    • half-a-year;
    • year;
    • any period;
    • the whole period.
  • Cluster nodes — select a cluster node to display the statistics.

Statistics is collected for the following parameters

  • outgoing traffic, GiB;
  • incoming traffic, GiB;
  • CPU, %;
  • IOPS;
  • RAM, %.
  • average system load;

Note

Per-minute statistics is kept for 5 days. Per-hour statistics is kept for one month and 3 days. Per-day statistics is kept for 2 years. When the specified periods expire, the data will be deleted.

Graphs for a random period are generated based on a per-hour statistics.

How statistics is collcted

Raw statistics is kept in the /usr/local/mgr5/var/stat/raw file and is updated every 5 minutes. Once an hour the control panel handles the raw statistics and delete it from the directory. The archive of the raw statistics is kept in /usr/local/mgr5/var/stat/mon/mainstat/.

Note

You can delete the archive of raw statistics only by means of the operating system.

Incoming and outgoing traffic

The information is taken from the /proc/net/dev file.Statistics files are copied to /var/stat/raw_bandwidth.

Receive Bytes — incoming traffic.

Transmit Bytes — outgoing traffic.

The main network interface of the cluster node is automatically selected as the interface.

Note

Network statistics are collected from physical and bonding interfaces. Statistics are not collected from virtual network interfaces.

CPU 

The information is taken from the /proc/stat file.

The CPU usage is calculated as follows:

(user+nive+system) / (user+nice+system+idle) * 100
BASH 
user — percentage of CPU utilization that occurred while executing at the user level.
nice — percentage of CPU utilization that occurred while executing at the user level with lower priority.
system —  percentage of CPU utilization that occurred while executing at the system level.
idle —  percentage of time that the CPU or CPUs were idle.

I/O operations

The information is collected from the /proc/diskstats file.

The usage is calculated as follows: 

NumReads+NumWrites
BASH

NumReads — field 1 of the file  /proc/diskstats (Field 1 -- # of reads issued).

NumWrites — field 5 of the file  /proc/diskstats (Field 5 -- # of writes completed).

The system calculates the data from all hard drives.

RAM

The information is collected from the /proc/meminfo function.

The usage is calculated as follows:

MemUsed / MemTotal * 100
BASH

MemUsed = MemTotal - MemFree.

MemFree — free + cached.

MemTotal — the total field.

System load average

The information is taken from the /proc/loadavg file.

VMmanager analyses the average value for the last 5 minutes.